/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dx.dex;

/**
 * Utility class to calculate the size of various structures in bytes.
 * 
 * @author rschilling
 */
public final class SizeOf {

	private SizeOf() {
	}

	public static final int UBYTE = 1;
	public static final int USHORT = 2;
	public static final int UINT = 4;

	public static final int SIGNATURE = UBYTE * 20;

	/**
	 * magic ubyte[8] checksum uint signature ubyte[20] file_size uint
	 * header_size uint endian_tag uint link_size uint link_off uint map_off
	 * uint string_ids_size uint string_ids_off uint type_ids_size uint
	 * type_ids_off uint proto_ids_size uint proto_ids_off uint field_ids_size
	 * uint field_ids_off uint method_ids_size uint method_ids_off uint
	 * class_defs_size uint class_defs_off uint data_size uint data_off uint
	 */
	public static final int HEADER_ITEM = (8 * UBYTE) + UINT + SIGNATURE
			+ (20 * UINT); // 0x70

	/**
	 * string_data_off uint
	 */
	public static final int STRING_ID_ITEM = UINT;

	/**
	 * descriptor_idx uint
	 */
	public static final int TYPE_ID_ITEM = UINT;

	/**
	 * type_idx ushort
	 */
	public static final int TYPE_ITEM = USHORT;

	/**
	 * shorty_idx uint return_type_idx uint return_type_idx uint
	 */
	public static final int PROTO_ID_ITEM = UINT + UINT + UINT;

	/**
	 * class_idx ushort type_idx ushort name_idx uint
	 */
	public static final int FIELD_ID_ITEM = USHORT + USHORT + UINT;

	/**
	 * class_idx ushort proto_idx ushort name_idx uint
	 */
	public static final int METHOD_ID_ITEM = USHORT + USHORT + UINT;

	/**
	 * class_idx ushort type_idx/proto_idx ushort name_idx uint
	 */
	public static final int MEMBER_ID_ITEM = USHORT + USHORT + UINT;

	/**
	 * class_idx uint access_flags uint superclass_idx uint interfaces_off uint
	 * source_file_idx uint annotations_off uint class_data_off uint
	 * static_values_off uint
	 */
	public static final int CLASS_DEF_ITEM = 8 * UINT;

	/**
	 * type ushort unused ushort size uint offset uint
	 */
	public static final int MAP_ITEM = USHORT + USHORT + UINT + UINT;

	/**
	 * uint
	 */
	public static final int ANNOTATION_SET_REF_ITEM = UINT;

	/**
	 * uint
	 */
	public static final int ANNOTATION_SET_ITEM = UINT;

	/**
	 * uint ushort ushort
	 */
	public static final int TRY_ITEM = UINT + USHORT + USHORT;

}
